#include<stdio.h>
int main ()
{
	int n;
	scanf("%d",&n);
	int count=0;
	while(n!=1)
	{
		if(n%2==0)
		{
			n=n/2;
		}
		else if(n%2==1)
		{
			n=3*n+1;
		}
		count++;
	}
	printf("%d\n",count);
} 
